Making Up the Rules: Three Postulates of Quantum Mechanics

If Hψ=eψ, why can't you just cancel the ψs? Operators, rules that change one function into another, play a key role in quantum chemistry. Each measurable quantity has a corresponding operator, and the operator, used in tandem with the wavefunction, can be used to calculate expected values of these quantities. We introduced the notion of the wavefunction as a vector in a function space and used Dirac's bra and ket notation to express the wavefunction and the expectation value.

MP3 podcast
screencast